Rotary transformer armature



Dec. 18; 133 H. s. m: MALAUSSENE R "31% RY TRANSFORMER ARMATURE Filed Dec. 15, 1933 2 Sheets-Sheet l u'o #HW/ 5. DE fiLAl/SSENE Dec. 18, 1934.

H. 5. DE MALAUSSENE 1,985,154

ROTARY TRANSFORMER ARMATURE Filed Dec. 15, 1933 2 Sheets-Sheet 2 Patented Dec. 18, 1934 UNITED STATES PATENT OFFICE 4 Claims.

The present invention relates to a rotary transformer especially adapted to supply a. direct, alternating current source of supply or both and more particularly to an improved type and construction of armature employed therein.

One of the objects of the present invention is to provide a rotary transformer which may be driven by a prime mover such as an internal combustion engine or the like from. which there may be ob-' talned a direct current source of supply, an alternating current source of supply or both.

A still further important object of the invention is to provide a rotary transformer of the character described which may be supplied with a direct current source of electrical supply and from which there may be obtained an alternating current source of supply.

A still further important attribute of the invention is to provide a rotary transformer which may be supplied with an alternating current source 01' supply and from which there may be obtained a direct current source of supply.

Heretofore, rotary transformers have been constructed which are adapted to change a low voltage direct current source of supply into a high voltage alternating current source of supply in which the armature is provided with a direct current winding thereon which is connected to the commutator and a superimposed D. C. winding connected to the slip rings. Such an armature construction for a rotary transformer of this character has been found not only inefllcient but unsatisfactory for the reason that it involves considerable expense not only in the manufacture of the armature, but also in the winding of the same.

It is therefore one of the objects of the present invention to construct an armature for a rotary transformer 01 this character which is efllcient, cheap to manufacture, by virtue of the particular slot arrangement therein, and simple and inexpensive to wind.

The invention'contemplates the provision of a single armature on which the direct current windings are placed in a plurality of spaced slots disposed on opposite sides of the armature. The direct current windings are connected to a commutator in the usual manner, and disposed between the oppositely arranged spaced slots in which the direct current windings are arranged, there are oppositely disposed slots in which two separate alternating coils are arranged and connected directly to a set of slip rings. The usual field windings common to both armature windings are wound on cores and connected in the usual shlmt series manner for producing the desired field.

In the accompanying drawings, forming a part of this application and in which like numerals are employed to designate like Parts throughout the same,

' the armature construction Figure 1 is an elevational View partly in section of the rotary transformer unit,

Figure 2 is an elevational view of the armature, illustrating the manner in which the direct current and alternating current windings are arranged thereon,

Figure 3 is a vertical sectional view of Figure 2, showing the construction of the armature and the manner in which the alternating and direct current windings are disposed thereon,

Figure 4 is an elevational view partly in section of the armature.

Figure 5 is a perspective view of the armature core without the shaft therein and the windings thereon,

Figure 6 is a schematic diagrammatical view, illustrating the manner in which the alternating and direct current windings are connected respectively to the slip ring and the commutator, and

Figure 7 is a further schematic diagrammatical view illustrating the manner in which the direct and alternating current windings are arranged in the slot in the armature.

In the drawings, wherein for the purpose of illustration is shown a preferred embodiment of the invention, and referring more particularly to Figure 1, the numeral 8 generally designates a yoke to which the field poles 10 are secured by means of the screw threaded bolts 12 and 14. Metal end covers 16 and 18 are securely fastened to the yoke and are provided with spaced ventilating slots 20 and 22 for maintaining the windings of the units at an eflicient operating temperature.

Each of the end covers are provided with suitable bearing housings 24 which have mounted therein ball bearings 26 cooperating with concentric bearing rings 28 and 30 for rotatably supporting the shaft 32 on which the armature core 34 is mounted. Series and shunt windings 36 are disposed on the spaced poles 10 secured to the yoke and are connected in the usual manner. Obviously, any type of field winding may be employed which will produce a field common to both the windings on the armature without departing from the spirit of the invention and it is therefore not deemed necessary to speciflcally describe in detail the field connection.

As hereinbefore pointed out, the invention is predicated upon the novel construction of the armature 34 and the method of.winding the direct and alternating current windings thereon.

Referring more particularly to Figure 5, wherein there is shown a perspective view of which consists of a substantially cylindrical shaped metallic body having a plurality of oppositely disposed spaced longitudinally extending slots 38 therein in which the direct current windings are arranged The side walls 40 of the slots 38 diverge inwardly to the end that a rectangular shaped wedge 42 of insulating material such as mica, bakelite, or the like, may be driven therein on top of the windings to securely hold them in position. Between the direct current slots 38 there are provided oppositely disposed alternating current slots 42 which as clearly illustrated have an area considerably greater than the combined areas of the direct current slots 38. The bottom walls 44 of the alternating current slots are substantially flat and in parallel relation and the side walls 46 diverge inwardly in the same manner as the side walls of the direct current slots, permitting flat .rectangular shaped wedges 4.8 to be driven therein on top of the pairs of alternating current coils 50 and 51 to securely fasten the same in position in the slot.

The armature body is provided with a longitudinally extending bore 52 in which there is securely fastened the armature shaft 32. As illustrated in Figure 4 on one end of the shaft 32 there is provided a pair of slip rings 54 and 56 which are mounted on insulating block 58 secured to the shaft, and-on the other end of the shaft there is securely fastened a commutator 60 of the usual construction.

The direct current windings 68 are wound in the slots 38 in any of the well known types of windings. However, for the purpose of illustration they may be wound as clearly shown in Figure 7 wherein the individual rectangular shaped windings extend in slot 1 around the ends of the armature in slot 2 and back to'slot 1. The next coil is arranged in slots 3 and 4. The next in slots 5 and 6, etc. Thedirect current windings are then in the usual manner connected to the commutator by means of the tops 72.

The alternating current windings consist of two separate coils '50 and 51 each having the same number of turns. The direct current winding is first placed on the armature and then the two alternating current coils are wound in the slots 42 and arranged thereon beside one another as illustrated clearly in Figure 1. One end '16 of the coil 51 is connected to the slip ring 54 and the coils 50 and 51 are connected in series and the free end of the coil 50 connected to the slip ring 56. g

The size of the direct current" conductors and the alternating current conductors as well as the relative number of turns of the windings may be varied depending upon the relative voltage of direct and alternating current desired. Thus, forexample, if it is desired to obtain six volts direct current and volts alternating current the size of the conductors of the direct current and the number of turns thereof will bear a definite relation with respect to the size of the conductors of the alternating current winding and the number of turns thereof.

It will thus be seen that by arranging the alternating current windings in two separate coils which are disposed in the large slot 42 arranged on opposite sides between the direct current slots not only may the number of turns of the alternating current winding be increased, but also the alternating current side of the armature may be wound with more facility and at a greatly reduced cost.

A rotary transformer armature constructed in this manner has been found to operate more efflciently and because of the particular arrangement of the alternating cin'rent winding a greater portion thereof is exposed to the air and consequently will operate at a moreeflicient temperature under normal conditions.

It is believed unnecessary to enumerate the various uses to which a rotary transformer of this character may be employed. However, by way of example, it is especially adapted for use in connection with motor vehicles, whereby the same may be supplied with six volts direct current from the battery thereof and a radio, neon sign, or any other illuminating means or the like operated with 110 volts alternating current from the alternating current side of the machine.

The rotary transformer may be constructed to any capacity or size and it is capable of various modifications and changes without departing from the spirit of the invention, and it is intended therefore that only such limitations shall be imposed thereon as are indicated in the prior art or in the appended claims.

I claim:

1. A rotary transformer armaturecomprising a cylindrical shaped, metallic body, having a lon-' gitudinal extending bore therein, said bore being provided with oppositely disposed groups of spaced longitudinally extending slots therein, adapted to receive a direct current winding, and oppositely disposed longitudinal alternating current winding slots between said groups of direct current winding slots, the areas of said alterhating current winding slots being greater than the combined areas of said groups of direct current winding slots.

2. A rotary transformer armature comprising a cylindrical shaped, metallic body, having a longitudinal extending bore therein, said bore being provided with oppositely disposed groups of spaced longitudinally extending slots therein, adapted to receive a direct current winding, and oppositely disposed longitudinal alternating current winding slots between said groups of direct current winding slots, the areas of said alternating current winding slots being greater than the combined areas of said groups of direct current winding slots, the side walls of each of said slots converging outwardly.

3. In a rotary transformer, an armature comprising a metallic cylindrical shaped body having a longitudinally extending bore therein, said body being provided with oppositely disposed groups of spaced longitudinally extending slots and oppositely disposed longitudinally extending slots between said groups of slots, the combined areas of the groups of slots being greater than the oppositely extending slots, a shaft in said bore, a commutator on one end of said shaft adjacent said bore, a pair of slip rings on the other end of said shaft, direct current windings disposed in said groups of slots and connected to said commutator in alternating current windings in said other slots and connected to said slip rings.

4. An armature core comprising a metallic cylindrical shaped body having a longitudinally extending bore therein, said body being provided 

